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1// SPDX-License-Identifier: GPL-2.0
2/* Copyright(c) 2017 Oracle and/or its affiliates. All rights reserved. */
3
4#include "ixgbe.h"
5#include <net/xfrm.h>
6#include <crypto/aead.h>
7#include <linux/if_bridge.h>
8
9#define IXGBE_IPSEC_KEY_BITS 160
10static const char aes_gcm_name[] = "rfc4106(gcm(aes))";
11
12static void ixgbe_ipsec_del_sa(struct xfrm_state *xs);
13
14/**
15 * ixgbe_ipsec_set_tx_sa - set the Tx SA registers
16 * @hw: hw specific details
17 * @idx: register index to write
18 * @key: key byte array
19 * @salt: salt bytes
20 **/
21static void ixgbe_ipsec_set_tx_sa(struct ixgbe_hw *hw, u16 idx,
22 u32 key[], u32 salt)
23{
24 u32 reg;
25 int i;
26
27 for (i = 0; i < 4; i++)
28 IXGBE_WRITE_REG(hw, IXGBE_IPSTXKEY(i),
29 (__force u32)cpu_to_be32(key[3 - i]));
30 IXGBE_WRITE_REG(hw, IXGBE_IPSTXSALT, (__force u32)cpu_to_be32(salt));
31 IXGBE_WRITE_FLUSH(hw);
32
33 reg = IXGBE_READ_REG(hw, IXGBE_IPSTXIDX);
34 reg &= IXGBE_RXTXIDX_IPS_EN;
35 reg |= idx << IXGBE_RXTXIDX_IDX_SHIFT | IXGBE_RXTXIDX_WRITE;
36 IXGBE_WRITE_REG(hw, IXGBE_IPSTXIDX, reg);
37 IXGBE_WRITE_FLUSH(hw);
38}
39
40/**
41 * ixgbe_ipsec_set_rx_item - set an Rx table item
42 * @hw: hw specific details
43 * @idx: register index to write
44 * @tbl: table selector
45 *
46 * Trigger the device to store into a particular Rx table the
47 * data that has already been loaded into the input register
48 **/
49static void ixgbe_ipsec_set_rx_item(struct ixgbe_hw *hw, u16 idx,
50 enum ixgbe_ipsec_tbl_sel tbl)
51{
52 u32 reg;
53
54 reg = IXGBE_READ_REG(hw, IXGBE_IPSRXIDX);
55 reg &= IXGBE_RXTXIDX_IPS_EN;
56 reg |= tbl << IXGBE_RXIDX_TBL_SHIFT |
57 idx << IXGBE_RXTXIDX_IDX_SHIFT |
58 IXGBE_RXTXIDX_WRITE;
59 IXGBE_WRITE_REG(hw, IXGBE_IPSRXIDX, reg);
60 IXGBE_WRITE_FLUSH(hw);
61}
62
63/**
64 * ixgbe_ipsec_set_rx_sa - set up the register bits to save SA info
65 * @hw: hw specific details
66 * @idx: register index to write
67 * @spi: security parameter index
68 * @key: key byte array
69 * @salt: salt bytes
70 * @mode: rx decrypt control bits
71 * @ip_idx: index into IP table for related IP address
72 **/
73static void ixgbe_ipsec_set_rx_sa(struct ixgbe_hw *hw, u16 idx, __be32 spi,
74 u32 key[], u32 salt, u32 mode, u32 ip_idx)
75{
76 int i;
77
78 /* store the SPI (in bigendian) and IPidx */
79 IXGBE_WRITE_REG(hw, IXGBE_IPSRXSPI,
80 (__force u32)cpu_to_le32((__force u32)spi));
81 IXGBE_WRITE_REG(hw, IXGBE_IPSRXIPIDX, ip_idx);
82 IXGBE_WRITE_FLUSH(hw);
83
84 ixgbe_ipsec_set_rx_item(hw, idx, ips_rx_spi_tbl);
85
86 /* store the key, salt, and mode */
87 for (i = 0; i < 4; i++)
88 IXGBE_WRITE_REG(hw, IXGBE_IPSRXKEY(i),
89 (__force u32)cpu_to_be32(key[3 - i]));
90 IXGBE_WRITE_REG(hw, IXGBE_IPSRXSALT, (__force u32)cpu_to_be32(salt));
91 IXGBE_WRITE_REG(hw, IXGBE_IPSRXMOD, mode);
92 IXGBE_WRITE_FLUSH(hw);
93
94 ixgbe_ipsec_set_rx_item(hw, idx, ips_rx_key_tbl);
95}
96
97/**
98 * ixgbe_ipsec_set_rx_ip - set up the register bits to save SA IP addr info
99 * @hw: hw specific details
100 * @idx: register index to write
101 * @addr: IP address byte array
102 **/
103static void ixgbe_ipsec_set_rx_ip(struct ixgbe_hw *hw, u16 idx, __be32 addr[])
104{
105 int i;
106
107 /* store the ip address */
108 for (i = 0; i < 4; i++)
109 IXGBE_WRITE_REG(hw, IXGBE_IPSRXIPADDR(i),
110 (__force u32)cpu_to_le32((__force u32)addr[i]));
111 IXGBE_WRITE_FLUSH(hw);
112
113 ixgbe_ipsec_set_rx_item(hw, idx, ips_rx_ip_tbl);
114}
115
116/**
117 * ixgbe_ipsec_clear_hw_tables - because some tables don't get cleared on reset
118 * @adapter: board private structure
119 **/
120static void ixgbe_ipsec_clear_hw_tables(struct ixgbe_adapter *adapter)
121{
122 struct ixgbe_hw *hw = &adapter->hw;
123 u32 buf[4] = {0, 0, 0, 0};
124 u16 idx;
125
126 /* disable Rx and Tx SA lookup */
127 IXGBE_WRITE_REG(hw, IXGBE_IPSRXIDX, 0);
128 IXGBE_WRITE_REG(hw, IXGBE_IPSTXIDX, 0);
129
130 /* scrub the tables - split the loops for the max of the IP table */
131 for (idx = 0; idx < IXGBE_IPSEC_MAX_RX_IP_COUNT; idx++) {
132 ixgbe_ipsec_set_tx_sa(hw, idx, buf, 0);
133 ixgbe_ipsec_set_rx_sa(hw, idx, 0, buf, 0, 0, 0);
134 ixgbe_ipsec_set_rx_ip(hw, idx, (__be32 *)buf);
135 }
136 for (; idx < IXGBE_IPSEC_MAX_SA_COUNT; idx++) {
137 ixgbe_ipsec_set_tx_sa(hw, idx, buf, 0);
138 ixgbe_ipsec_set_rx_sa(hw, idx, 0, buf, 0, 0, 0);
139 }
140}
141
142/**
143 * ixgbe_ipsec_stop_data
144 * @adapter: board private structure
145 **/
146static void ixgbe_ipsec_stop_data(struct ixgbe_adapter *adapter)
147{
148 struct ixgbe_hw *hw = &adapter->hw;
149 bool link = adapter->link_up;
150 u32 t_rdy, r_rdy;
151 u32 limit;
152 u32 reg;
153
154 /* halt data paths */
155 reg = IXGBE_READ_REG(hw, IXGBE_SECTXCTRL);
156 reg |= IXGBE_SECTXCTRL_TX_DIS;
157 IXGBE_WRITE_REG(hw, IXGBE_SECTXCTRL, reg);
158
159 reg = IXGBE_READ_REG(hw, IXGBE_SECRXCTRL);
160 reg |= IXGBE_SECRXCTRL_RX_DIS;
161 IXGBE_WRITE_REG(hw, IXGBE_SECRXCTRL, reg);
162
163 /* If both Tx and Rx are ready there are no packets
164 * that we need to flush so the loopback configuration
165 * below is not necessary.
166 */
167 t_rdy = IXGBE_READ_REG(hw, IXGBE_SECTXSTAT) &
168 IXGBE_SECTXSTAT_SECTX_RDY;
169 r_rdy = IXGBE_READ_REG(hw, IXGBE_SECRXSTAT) &
170 IXGBE_SECRXSTAT_SECRX_RDY;
171 if (t_rdy && r_rdy)
172 return;
173
174 /* If the tx fifo doesn't have link, but still has data,
175 * we can't clear the tx sec block. Set the MAC loopback
176 * before block clear
177 */
178 if (!link) {
179 reg = IXGBE_READ_REG(hw, IXGBE_MACC);
180 reg |= IXGBE_MACC_FLU;
181 IXGBE_WRITE_REG(hw, IXGBE_MACC, reg);
182
183 reg = IXGBE_READ_REG(hw, IXGBE_HLREG0);
184 reg |= IXGBE_HLREG0_LPBK;
185 IXGBE_WRITE_REG(hw, IXGBE_HLREG0, reg);
186
187 IXGBE_WRITE_FLUSH(hw);
188 mdelay(3);
189 }
190
191 /* wait for the paths to empty */
192 limit = 20;
193 do {
194 mdelay(10);
195 t_rdy = IXGBE_READ_REG(hw, IXGBE_SECTXSTAT) &
196 IXGBE_SECTXSTAT_SECTX_RDY;
197 r_rdy = IXGBE_READ_REG(hw, IXGBE_SECRXSTAT) &
198 IXGBE_SECRXSTAT_SECRX_RDY;
199 } while (!(t_rdy && r_rdy) && limit--);
200
201 /* undo loopback if we played with it earlier */
202 if (!link) {
203 reg = IXGBE_READ_REG(hw, IXGBE_MACC);
204 reg &= ~IXGBE_MACC_FLU;
205 IXGBE_WRITE_REG(hw, IXGBE_MACC, reg);
206
207 reg = IXGBE_READ_REG(hw, IXGBE_HLREG0);
208 reg &= ~IXGBE_HLREG0_LPBK;
209 IXGBE_WRITE_REG(hw, IXGBE_HLREG0, reg);
210
211 IXGBE_WRITE_FLUSH(hw);
212 }
213}
214
215/**
216 * ixgbe_ipsec_stop_engine
217 * @adapter: board private structure
218 **/
219static void ixgbe_ipsec_stop_engine(struct ixgbe_adapter *adapter)
220{
221 struct ixgbe_hw *hw = &adapter->hw;
222 u32 reg;
223
224 ixgbe_ipsec_stop_data(adapter);
225
226 /* disable Rx and Tx SA lookup */
227 IXGBE_WRITE_REG(hw, IXGBE_IPSTXIDX, 0);
228 IXGBE_WRITE_REG(hw, IXGBE_IPSRXIDX, 0);
229
230 /* disable the Rx and Tx engines and full packet store-n-forward */
231 reg = IXGBE_READ_REG(hw, IXGBE_SECTXCTRL);
232 reg |= IXGBE_SECTXCTRL_SECTX_DIS;
233 reg &= ~IXGBE_SECTXCTRL_STORE_FORWARD;
234 IXGBE_WRITE_REG(hw, IXGBE_SECTXCTRL, reg);
235
236 reg = IXGBE_READ_REG(hw, IXGBE_SECRXCTRL);
237 reg |= IXGBE_SECRXCTRL_SECRX_DIS;
238 IXGBE_WRITE_REG(hw, IXGBE_SECRXCTRL, reg);
239
240 /* restore the "tx security buffer almost full threshold" to 0x250 */
241 IXGBE_WRITE_REG(hw, IXGBE_SECTXBUFFAF, 0x250);
242
243 /* Set minimum IFG between packets back to the default 0x1 */
244 reg = IXGBE_READ_REG(hw, IXGBE_SECTXMINIFG);
245 reg = (reg & 0xfffffff0) | 0x1;
246 IXGBE_WRITE_REG(hw, IXGBE_SECTXMINIFG, reg);
247
248 /* final set for normal (no ipsec offload) processing */
249 IXGBE_WRITE_REG(hw, IXGBE_SECTXCTRL, IXGBE_SECTXCTRL_SECTX_DIS);
250 IXGBE_WRITE_REG(hw, IXGBE_SECRXCTRL, IXGBE_SECRXCTRL_SECRX_DIS);
251
252 IXGBE_WRITE_FLUSH(hw);
253}
254
255/**
256 * ixgbe_ipsec_start_engine
257 * @adapter: board private structure
258 *
259 * NOTE: this increases power consumption whether being used or not
260 **/
261static void ixgbe_ipsec_start_engine(struct ixgbe_adapter *adapter)
262{
263 struct ixgbe_hw *hw = &adapter->hw;
264 u32 reg;
265
266 ixgbe_ipsec_stop_data(adapter);
267
268 /* Set minimum IFG between packets to 3 */
269 reg = IXGBE_READ_REG(hw, IXGBE_SECTXMINIFG);
270 reg = (reg & 0xfffffff0) | 0x3;
271 IXGBE_WRITE_REG(hw, IXGBE_SECTXMINIFG, reg);
272
273 /* Set "tx security buffer almost full threshold" to 0x15 so that the
274 * almost full indication is generated only after buffer contains at
275 * least an entire jumbo packet.
276 */
277 reg = IXGBE_READ_REG(hw, IXGBE_SECTXBUFFAF);
278 reg = (reg & 0xfffffc00) | 0x15;
279 IXGBE_WRITE_REG(hw, IXGBE_SECTXBUFFAF, reg);
280
281 /* restart the data paths by clearing the DISABLE bits */
282 IXGBE_WRITE_REG(hw, IXGBE_SECRXCTRL, 0);
283 IXGBE_WRITE_REG(hw, IXGBE_SECTXCTRL, IXGBE_SECTXCTRL_STORE_FORWARD);
284
285 /* enable Rx and Tx SA lookup */
286 IXGBE_WRITE_REG(hw, IXGBE_IPSTXIDX, IXGBE_RXTXIDX_IPS_EN);
287 IXGBE_WRITE_REG(hw, IXGBE_IPSRXIDX, IXGBE_RXTXIDX_IPS_EN);
288
289 IXGBE_WRITE_FLUSH(hw);
290}
291
292/**
293 * ixgbe_ipsec_restore - restore the ipsec HW settings after a reset
294 * @adapter: board private structure
295 *
296 * Reload the HW tables from the SW tables after they've been bashed
297 * by a chip reset.
298 *
299 * Any VF entries are removed from the SW and HW tables since either
300 * (a) the VF also gets reset on PF reset and will ask again for the
301 * offloads, or (b) the VF has been removed by a change in the num_vfs.
302 **/
303void ixgbe_ipsec_restore(struct ixgbe_adapter *adapter)
304{
305 struct ixgbe_ipsec *ipsec = adapter->ipsec;
306 struct ixgbe_hw *hw = &adapter->hw;
307 int i;
308
309 if (!(adapter->flags2 & IXGBE_FLAG2_IPSEC_ENABLED))
310 return;
311
312 /* clean up and restart the engine */
313 ixgbe_ipsec_stop_engine(adapter);
314 ixgbe_ipsec_clear_hw_tables(adapter);
315 ixgbe_ipsec_start_engine(adapter);
316
317 /* reload the Rx and Tx keys */
318 for (i = 0; i < IXGBE_IPSEC_MAX_SA_COUNT; i++) {
319 struct rx_sa *r = &ipsec->rx_tbl[i];
320 struct tx_sa *t = &ipsec->tx_tbl[i];
321
322 if (r->used) {
323 if (r->mode & IXGBE_RXTXMOD_VF)
324 ixgbe_ipsec_del_sa(r->xs);
325 else
326 ixgbe_ipsec_set_rx_sa(hw, i, r->xs->id.spi,
327 r->key, r->salt,
328 r->mode, r->iptbl_ind);
329 }
330
331 if (t->used) {
332 if (t->mode & IXGBE_RXTXMOD_VF)
333 ixgbe_ipsec_del_sa(t->xs);
334 else
335 ixgbe_ipsec_set_tx_sa(hw, i, t->key, t->salt);
336 }
337 }
338
339 /* reload the IP addrs */
340 for (i = 0; i < IXGBE_IPSEC_MAX_RX_IP_COUNT; i++) {
341 struct rx_ip_sa *ipsa = &ipsec->ip_tbl[i];
342
343 if (ipsa->used)
344 ixgbe_ipsec_set_rx_ip(hw, i, ipsa->ipaddr);
345 }
346}
347
348/**
349 * ixgbe_ipsec_find_empty_idx - find the first unused security parameter index
350 * @ipsec: pointer to ipsec struct
351 * @rxtable: true if we need to look in the Rx table
352 *
353 * Returns the first unused index in either the Rx or Tx SA table
354 **/
355static int ixgbe_ipsec_find_empty_idx(struct ixgbe_ipsec *ipsec, bool rxtable)
356{
357 u32 i;
358
359 if (rxtable) {
360 if (ipsec->num_rx_sa == IXGBE_IPSEC_MAX_SA_COUNT)
361 return -ENOSPC;
362
363 /* search rx sa table */
364 for (i = 0; i < IXGBE_IPSEC_MAX_SA_COUNT; i++) {
365 if (!ipsec->rx_tbl[i].used)
366 return i;
367 }
368 } else {
369 if (ipsec->num_tx_sa == IXGBE_IPSEC_MAX_SA_COUNT)
370 return -ENOSPC;
371
372 /* search tx sa table */
373 for (i = 0; i < IXGBE_IPSEC_MAX_SA_COUNT; i++) {
374 if (!ipsec->tx_tbl[i].used)
375 return i;
376 }
377 }
378
379 return -ENOSPC;
380}
381
382/**
383 * ixgbe_ipsec_find_rx_state - find the state that matches
384 * @ipsec: pointer to ipsec struct
385 * @daddr: inbound address to match
386 * @proto: protocol to match
387 * @spi: SPI to match
388 * @ip4: true if using an ipv4 address
389 *
390 * Returns a pointer to the matching SA state information
391 **/
392static struct xfrm_state *ixgbe_ipsec_find_rx_state(struct ixgbe_ipsec *ipsec,
393 __be32 *daddr, u8 proto,
394 __be32 spi, bool ip4)
395{
396 struct rx_sa *rsa;
397 struct xfrm_state *ret = NULL;
398
399 rcu_read_lock();
400 hash_for_each_possible_rcu(ipsec->rx_sa_list, rsa, hlist,
401 (__force u32)spi) {
402 if (rsa->mode & IXGBE_RXTXMOD_VF)
403 continue;
404 if (spi == rsa->xs->id.spi &&
405 ((ip4 && *daddr == rsa->xs->id.daddr.a4) ||
406 (!ip4 && !memcmp(daddr, &rsa->xs->id.daddr.a6,
407 sizeof(rsa->xs->id.daddr.a6)))) &&
408 proto == rsa->xs->id.proto) {
409 ret = rsa->xs;
410 xfrm_state_hold(ret);
411 break;
412 }
413 }
414 rcu_read_unlock();
415 return ret;
416}
417
418/**
419 * ixgbe_ipsec_parse_proto_keys - find the key and salt based on the protocol
420 * @xs: pointer to xfrm_state struct
421 * @mykey: pointer to key array to populate
422 * @mysalt: pointer to salt value to populate
423 *
424 * This copies the protocol keys and salt to our own data tables. The
425 * 82599 family only supports the one algorithm.
426 **/
427static int ixgbe_ipsec_parse_proto_keys(struct xfrm_state *xs,
428 u32 *mykey, u32 *mysalt)
429{
430 struct net_device *dev = xs->xso.real_dev;
431 unsigned char *key_data;
432 char *alg_name = NULL;
433 int key_len;
434
435 if (!xs->aead) {
436 netdev_err(dev, "Unsupported IPsec algorithm\n");
437 return -EINVAL;
438 }
439
440 if (xs->aead->alg_icv_len != IXGBE_IPSEC_AUTH_BITS) {
441 netdev_err(dev, "IPsec offload requires %d bit authentication\n",
442 IXGBE_IPSEC_AUTH_BITS);
443 return -EINVAL;
444 }
445
446 key_data = &xs->aead->alg_key[0];
447 key_len = xs->aead->alg_key_len;
448 alg_name = xs->aead->alg_name;
449
450 if (strcmp(alg_name, aes_gcm_name)) {
451 netdev_err(dev, "Unsupported IPsec algorithm - please use %s\n",
452 aes_gcm_name);
453 return -EINVAL;
454 }
455
456 /* The key bytes come down in a bigendian array of bytes, so
457 * we don't need to do any byteswapping.
458 * 160 accounts for 16 byte key and 4 byte salt
459 */
460 if (key_len == IXGBE_IPSEC_KEY_BITS) {
461 *mysalt = ((u32 *)key_data)[4];
462 } else if (key_len != (IXGBE_IPSEC_KEY_BITS - (sizeof(*mysalt) * 8))) {
463 netdev_err(dev, "IPsec hw offload only supports keys up to 128 bits with a 32 bit salt\n");
464 return -EINVAL;
465 } else {
466 netdev_info(dev, "IPsec hw offload parameters missing 32 bit salt value\n");
467 *mysalt = 0;
468 }
469 memcpy(mykey, key_data, 16);
470
471 return 0;
472}
473
474/**
475 * ixgbe_ipsec_check_mgmt_ip - make sure there is no clash with mgmt IP filters
476 * @xs: pointer to transformer state struct
477 **/
478static int ixgbe_ipsec_check_mgmt_ip(struct xfrm_state *xs)
479{
480 struct net_device *dev = xs->xso.real_dev;
481 struct ixgbe_adapter *adapter = netdev_priv(dev);
482 struct ixgbe_hw *hw = &adapter->hw;
483 u32 mfval, manc, reg;
484 int num_filters = 4;
485 bool manc_ipv4;
486 u32 bmcipval;
487 int i, j;
488
489#define MANC_EN_IPV4_FILTER BIT(24)
490#define MFVAL_IPV4_FILTER_SHIFT 16
491#define MFVAL_IPV6_FILTER_SHIFT 24
492#define MIPAF_ARR(_m, _n) (IXGBE_MIPAF + ((_m) * 0x10) + ((_n) * 4))
493
494#define IXGBE_BMCIP(_n) (0x5050 + ((_n) * 4))
495#define IXGBE_BMCIPVAL 0x5060
496#define BMCIP_V4 0x2
497#define BMCIP_V6 0x3
498#define BMCIP_MASK 0x3
499
500 manc = IXGBE_READ_REG(hw, IXGBE_MANC);
501 manc_ipv4 = !!(manc & MANC_EN_IPV4_FILTER);
502 mfval = IXGBE_READ_REG(hw, IXGBE_MFVAL);
503 bmcipval = IXGBE_READ_REG(hw, IXGBE_BMCIPVAL);
504
505 if (xs->props.family == AF_INET) {
506 /* are there any IPv4 filters to check? */
507 if (manc_ipv4) {
508 /* the 4 ipv4 filters are all in MIPAF(3, i) */
509 for (i = 0; i < num_filters; i++) {
510 if (!(mfval & BIT(MFVAL_IPV4_FILTER_SHIFT + i)))
511 continue;
512
513 reg = IXGBE_READ_REG(hw, MIPAF_ARR(3, i));
514 if (reg == (__force u32)xs->id.daddr.a4)
515 return 1;
516 }
517 }
518
519 if ((bmcipval & BMCIP_MASK) == BMCIP_V4) {
520 reg = IXGBE_READ_REG(hw, IXGBE_BMCIP(3));
521 if (reg == (__force u32)xs->id.daddr.a4)
522 return 1;
523 }
524
525 } else {
526 /* if there are ipv4 filters, they are in the last ipv6 slot */
527 if (manc_ipv4)
528 num_filters = 3;
529
530 for (i = 0; i < num_filters; i++) {
531 if (!(mfval & BIT(MFVAL_IPV6_FILTER_SHIFT + i)))
532 continue;
533
534 for (j = 0; j < 4; j++) {
535 reg = IXGBE_READ_REG(hw, MIPAF_ARR(i, j));
536 if (reg != (__force u32)xs->id.daddr.a6[j])
537 break;
538 }
539 if (j == 4) /* did we match all 4 words? */
540 return 1;
541 }
542
543 if ((bmcipval & BMCIP_MASK) == BMCIP_V6) {
544 for (j = 0; j < 4; j++) {
545 reg = IXGBE_READ_REG(hw, IXGBE_BMCIP(j));
546 if (reg != (__force u32)xs->id.daddr.a6[j])
547 break;
548 }
549 if (j == 4) /* did we match all 4 words? */
550 return 1;
551 }
552 }
553
554 return 0;
555}
556
557/**
558 * ixgbe_ipsec_add_sa - program device with a security association
559 * @xs: pointer to transformer state struct
560 * @extack: extack point to fill failure reason
561 **/
562static int ixgbe_ipsec_add_sa(struct xfrm_state *xs,
563 struct netlink_ext_ack *extack)
564{
565 struct net_device *dev = xs->xso.real_dev;
566 struct ixgbe_adapter *adapter = netdev_priv(dev);
567 struct ixgbe_ipsec *ipsec = adapter->ipsec;
568 struct ixgbe_hw *hw = &adapter->hw;
569 int checked, match, first;
570 u16 sa_idx;
571 int ret;
572 int i;
573
574 if (xs->id.proto != IPPROTO_ESP && xs->id.proto != IPPROTO_AH) {
575 NL_SET_ERR_MSG_MOD(extack, "Unsupported protocol for ipsec offload");
576 return -EINVAL;
577 }
578
579 if (xs->props.mode != XFRM_MODE_TRANSPORT) {
580 NL_SET_ERR_MSG_MOD(extack, "Unsupported mode for ipsec offload");
581 return -EINVAL;
582 }
583
584 if (ixgbe_ipsec_check_mgmt_ip(xs)) {
585 NL_SET_ERR_MSG_MOD(extack, "IPsec IP addr clash with mgmt filters");
586 return -EINVAL;
587 }
588
589 if (xs->xso.type != XFRM_DEV_OFFLOAD_CRYPTO) {
590 NL_SET_ERR_MSG_MOD(extack, "Unsupported ipsec offload type");
591 return -EINVAL;
592 }
593
594 if (xs->xso.dir == XFRM_DEV_OFFLOAD_IN) {
595 struct rx_sa rsa;
596
597 if (xs->calg) {
598 NL_SET_ERR_MSG_MOD(extack, "Compression offload not supported");
599 return -EINVAL;
600 }
601
602 /* find the first unused index */
603 ret = ixgbe_ipsec_find_empty_idx(ipsec, true);
604 if (ret < 0) {
605 NL_SET_ERR_MSG_MOD(extack, "No space for SA in Rx table!");
606 return ret;
607 }
608 sa_idx = (u16)ret;
609
610 memset(&rsa, 0, sizeof(rsa));
611 rsa.used = true;
612 rsa.xs = xs;
613
614 if (rsa.xs->id.proto & IPPROTO_ESP)
615 rsa.decrypt = xs->ealg || xs->aead;
616
617 /* get the key and salt */
618 ret = ixgbe_ipsec_parse_proto_keys(xs, rsa.key, &rsa.salt);
619 if (ret) {
620 NL_SET_ERR_MSG_MOD(extack, "Failed to get key data for Rx SA table");
621 return ret;
622 }
623
624 /* get ip for rx sa table */
625 if (xs->props.family == AF_INET6)
626 memcpy(rsa.ipaddr, &xs->id.daddr.a6, 16);
627 else
628 memcpy(&rsa.ipaddr[3], &xs->id.daddr.a4, 4);
629
630 /* The HW does not have a 1:1 mapping from keys to IP addrs, so
631 * check for a matching IP addr entry in the table. If the addr
632 * already exists, use it; else find an unused slot and add the
633 * addr. If one does not exist and there are no unused table
634 * entries, fail the request.
635 */
636
637 /* Find an existing match or first not used, and stop looking
638 * after we've checked all we know we have.
639 */
640 checked = 0;
641 match = -1;
642 first = -1;
643 for (i = 0;
644 i < IXGBE_IPSEC_MAX_RX_IP_COUNT &&
645 (checked < ipsec->num_rx_sa || first < 0);
646 i++) {
647 if (ipsec->ip_tbl[i].used) {
648 if (!memcmp(ipsec->ip_tbl[i].ipaddr,
649 rsa.ipaddr, sizeof(rsa.ipaddr))) {
650 match = i;
651 break;
652 }
653 checked++;
654 } else if (first < 0) {
655 first = i; /* track the first empty seen */
656 }
657 }
658
659 if (ipsec->num_rx_sa == 0)
660 first = 0;
661
662 if (match >= 0) {
663 /* addrs are the same, we should use this one */
664 rsa.iptbl_ind = match;
665 ipsec->ip_tbl[match].ref_cnt++;
666
667 } else if (first >= 0) {
668 /* no matches, but here's an empty slot */
669 rsa.iptbl_ind = first;
670
671 memcpy(ipsec->ip_tbl[first].ipaddr,
672 rsa.ipaddr, sizeof(rsa.ipaddr));
673 ipsec->ip_tbl[first].ref_cnt = 1;
674 ipsec->ip_tbl[first].used = true;
675
676 ixgbe_ipsec_set_rx_ip(hw, rsa.iptbl_ind, rsa.ipaddr);
677
678 } else {
679 /* no match and no empty slot */
680 NL_SET_ERR_MSG_MOD(extack, "No space for SA in Rx IP SA table");
681 memset(&rsa, 0, sizeof(rsa));
682 return -ENOSPC;
683 }
684
685 rsa.mode = IXGBE_RXMOD_VALID;
686 if (rsa.xs->id.proto & IPPROTO_ESP)
687 rsa.mode |= IXGBE_RXMOD_PROTO_ESP;
688 if (rsa.decrypt)
689 rsa.mode |= IXGBE_RXMOD_DECRYPT;
690 if (rsa.xs->props.family == AF_INET6)
691 rsa.mode |= IXGBE_RXMOD_IPV6;
692
693 /* the preparations worked, so save the info */
694 memcpy(&ipsec->rx_tbl[sa_idx], &rsa, sizeof(rsa));
695
696 ixgbe_ipsec_set_rx_sa(hw, sa_idx, rsa.xs->id.spi, rsa.key,
697 rsa.salt, rsa.mode, rsa.iptbl_ind);
698 xs->xso.offload_handle = sa_idx + IXGBE_IPSEC_BASE_RX_INDEX;
699
700 ipsec->num_rx_sa++;
701
702 /* hash the new entry for faster search in Rx path */
703 hash_add_rcu(ipsec->rx_sa_list, &ipsec->rx_tbl[sa_idx].hlist,
704 (__force u32)rsa.xs->id.spi);
705 } else {
706 struct tx_sa tsa;
707
708 if (adapter->num_vfs &&
709 adapter->bridge_mode != BRIDGE_MODE_VEPA)
710 return -EOPNOTSUPP;
711
712 /* find the first unused index */
713 ret = ixgbe_ipsec_find_empty_idx(ipsec, false);
714 if (ret < 0) {
715 NL_SET_ERR_MSG_MOD(extack, "No space for SA in Tx table");
716 return ret;
717 }
718 sa_idx = (u16)ret;
719
720 memset(&tsa, 0, sizeof(tsa));
721 tsa.used = true;
722 tsa.xs = xs;
723
724 if (xs->id.proto & IPPROTO_ESP)
725 tsa.encrypt = xs->ealg || xs->aead;
726
727 ret = ixgbe_ipsec_parse_proto_keys(xs, tsa.key, &tsa.salt);
728 if (ret) {
729 NL_SET_ERR_MSG_MOD(extack, "Failed to get key data for Tx SA table");
730 memset(&tsa, 0, sizeof(tsa));
731 return ret;
732 }
733
734 /* the preparations worked, so save the info */
735 memcpy(&ipsec->tx_tbl[sa_idx], &tsa, sizeof(tsa));
736
737 ixgbe_ipsec_set_tx_sa(hw, sa_idx, tsa.key, tsa.salt);
738
739 xs->xso.offload_handle = sa_idx + IXGBE_IPSEC_BASE_TX_INDEX;
740
741 ipsec->num_tx_sa++;
742 }
743
744 /* enable the engine if not already warmed up */
745 if (!(adapter->flags2 & IXGBE_FLAG2_IPSEC_ENABLED)) {
746 ixgbe_ipsec_start_engine(adapter);
747 adapter->flags2 |= IXGBE_FLAG2_IPSEC_ENABLED;
748 }
749
750 return 0;
751}
752
753/**
754 * ixgbe_ipsec_del_sa - clear out this specific SA
755 * @xs: pointer to transformer state struct
756 **/
757static void ixgbe_ipsec_del_sa(struct xfrm_state *xs)
758{
759 struct net_device *dev = xs->xso.real_dev;
760 struct ixgbe_adapter *adapter = netdev_priv(dev);
761 struct ixgbe_ipsec *ipsec = adapter->ipsec;
762 struct ixgbe_hw *hw = &adapter->hw;
763 u32 zerobuf[4] = {0, 0, 0, 0};
764 u16 sa_idx;
765
766 if (xs->xso.dir == XFRM_DEV_OFFLOAD_IN) {
767 struct rx_sa *rsa;
768 u8 ipi;
769
770 sa_idx = xs->xso.offload_handle - IXGBE_IPSEC_BASE_RX_INDEX;
771 rsa = &ipsec->rx_tbl[sa_idx];
772
773 if (!rsa->used) {
774 netdev_err(dev, "Invalid Rx SA selected sa_idx=%d offload_handle=%lu\n",
775 sa_idx, xs->xso.offload_handle);
776 return;
777 }
778
779 ixgbe_ipsec_set_rx_sa(hw, sa_idx, 0, zerobuf, 0, 0, 0);
780 hash_del_rcu(&rsa->hlist);
781
782 /* if the IP table entry is referenced by only this SA,
783 * i.e. ref_cnt is only 1, clear the IP table entry as well
784 */
785 ipi = rsa->iptbl_ind;
786 if (ipsec->ip_tbl[ipi].ref_cnt > 0) {
787 ipsec->ip_tbl[ipi].ref_cnt--;
788
789 if (!ipsec->ip_tbl[ipi].ref_cnt) {
790 memset(&ipsec->ip_tbl[ipi], 0,
791 sizeof(struct rx_ip_sa));
792 ixgbe_ipsec_set_rx_ip(hw, ipi,
793 (__force __be32 *)zerobuf);
794 }
795 }
796
797 memset(rsa, 0, sizeof(struct rx_sa));
798 ipsec->num_rx_sa--;
799 } else {
800 sa_idx = xs->xso.offload_handle - IXGBE_IPSEC_BASE_TX_INDEX;
801
802 if (!ipsec->tx_tbl[sa_idx].used) {
803 netdev_err(dev, "Invalid Tx SA selected sa_idx=%d offload_handle=%lu\n",
804 sa_idx, xs->xso.offload_handle);
805 return;
806 }
807
808 ixgbe_ipsec_set_tx_sa(hw, sa_idx, zerobuf, 0);
809 memset(&ipsec->tx_tbl[sa_idx], 0, sizeof(struct tx_sa));
810 ipsec->num_tx_sa--;
811 }
812
813 /* if there are no SAs left, stop the engine to save energy */
814 if (ipsec->num_rx_sa == 0 && ipsec->num_tx_sa == 0) {
815 adapter->flags2 &= ~IXGBE_FLAG2_IPSEC_ENABLED;
816 ixgbe_ipsec_stop_engine(adapter);
817 }
818}
819
820/**
821 * ixgbe_ipsec_offload_ok - can this packet use the xfrm hw offload
822 * @skb: current data packet
823 * @xs: pointer to transformer state struct
824 **/
825static bool ixgbe_ipsec_offload_ok(struct sk_buff *skb, struct xfrm_state *xs)
826{
827 if (xs->props.family == AF_INET) {
828 /* Offload with IPv4 options is not supported yet */
829 if (ip_hdr(skb)->ihl != 5)
830 return false;
831 } else {
832 /* Offload with IPv6 extension headers is not support yet */
833 if (ipv6_ext_hdr(ipv6_hdr(skb)->nexthdr))
834 return false;
835 }
836
837 return true;
838}
839
840static const struct xfrmdev_ops ixgbe_xfrmdev_ops = {
841 .xdo_dev_state_add = ixgbe_ipsec_add_sa,
842 .xdo_dev_state_delete = ixgbe_ipsec_del_sa,
843 .xdo_dev_offload_ok = ixgbe_ipsec_offload_ok,
844};
845
846/**
847 * ixgbe_ipsec_vf_clear - clear the tables of data for a VF
848 * @adapter: board private structure
849 * @vf: VF id to be removed
850 **/
851void ixgbe_ipsec_vf_clear(struct ixgbe_adapter *adapter, u32 vf)
852{
853 struct ixgbe_ipsec *ipsec = adapter->ipsec;
854 int i;
855
856 if (!ipsec)
857 return;
858
859 /* search rx sa table */
860 for (i = 0; i < IXGBE_IPSEC_MAX_SA_COUNT && ipsec->num_rx_sa; i++) {
861 if (!ipsec->rx_tbl[i].used)
862 continue;
863 if (ipsec->rx_tbl[i].mode & IXGBE_RXTXMOD_VF &&
864 ipsec->rx_tbl[i].vf == vf)
865 ixgbe_ipsec_del_sa(ipsec->rx_tbl[i].xs);
866 }
867
868 /* search tx sa table */
869 for (i = 0; i < IXGBE_IPSEC_MAX_SA_COUNT && ipsec->num_tx_sa; i++) {
870 if (!ipsec->tx_tbl[i].used)
871 continue;
872 if (ipsec->tx_tbl[i].mode & IXGBE_RXTXMOD_VF &&
873 ipsec->tx_tbl[i].vf == vf)
874 ixgbe_ipsec_del_sa(ipsec->tx_tbl[i].xs);
875 }
876}
877
878/**
879 * ixgbe_ipsec_vf_add_sa - translate VF request to SA add
880 * @adapter: board private structure
881 * @msgbuf: The message buffer
882 * @vf: the VF index
883 *
884 * Make up a new xs and algorithm info from the data sent by the VF.
885 * We only need to sketch in just enough to set up the HW offload.
886 * Put the resulting offload_handle into the return message to the VF.
887 *
888 * Returns 0 or error value
889 **/
890int ixgbe_ipsec_vf_add_sa(struct ixgbe_adapter *adapter, u32 *msgbuf, u32 vf)
891{
892 struct ixgbe_ipsec *ipsec = adapter->ipsec;
893 struct xfrm_algo_desc *algo;
894 struct sa_mbx_msg *sam;
895 struct xfrm_state *xs;
896 size_t aead_len;
897 u16 sa_idx;
898 u32 pfsa;
899 int err;
900
901 sam = (struct sa_mbx_msg *)(&msgbuf[1]);
902 if (!adapter->vfinfo[vf].trusted ||
903 !(adapter->flags2 & IXGBE_FLAG2_VF_IPSEC_ENABLED)) {
904 e_warn(drv, "VF %d attempted to add an IPsec SA\n", vf);
905 err = -EACCES;
906 goto err_out;
907 }
908
909 /* Tx IPsec offload doesn't seem to work on this
910 * device, so block these requests for now.
911 */
912 if (sam->dir != XFRM_DEV_OFFLOAD_IN) {
913 err = -EOPNOTSUPP;
914 goto err_out;
915 }
916
917 algo = xfrm_aead_get_byname(aes_gcm_name, IXGBE_IPSEC_AUTH_BITS, 1);
918 if (unlikely(!algo)) {
919 err = -ENOENT;
920 goto err_out;
921 }
922
923 xs = kzalloc(sizeof(*xs), GFP_ATOMIC);
924 if (unlikely(!xs)) {
925 err = -ENOMEM;
926 goto err_out;
927 }
928
929 xs->xso.dir = sam->dir;
930 xs->id.spi = sam->spi;
931 xs->id.proto = sam->proto;
932 xs->props.family = sam->family;
933 if (xs->props.family == AF_INET6)
934 memcpy(&xs->id.daddr.a6, sam->addr, sizeof(xs->id.daddr.a6));
935 else
936 memcpy(&xs->id.daddr.a4, sam->addr, sizeof(xs->id.daddr.a4));
937 xs->xso.dev = adapter->netdev;
938
939 aead_len = sizeof(*xs->aead) + IXGBE_IPSEC_KEY_BITS / 8;
940 xs->aead = kzalloc(aead_len, GFP_ATOMIC);
941 if (unlikely(!xs->aead)) {
942 err = -ENOMEM;
943 goto err_xs;
944 }
945
946 xs->props.ealgo = algo->desc.sadb_alg_id;
947 xs->geniv = algo->uinfo.aead.geniv;
948 xs->aead->alg_icv_len = IXGBE_IPSEC_AUTH_BITS;
949 xs->aead->alg_key_len = IXGBE_IPSEC_KEY_BITS;
950 memcpy(xs->aead->alg_key, sam->key, sizeof(sam->key));
951 memcpy(xs->aead->alg_name, aes_gcm_name, sizeof(aes_gcm_name));
952
953 /* set up the HW offload */
954 err = ixgbe_ipsec_add_sa(xs, NULL);
955 if (err)
956 goto err_aead;
957
958 pfsa = xs->xso.offload_handle;
959 if (pfsa < IXGBE_IPSEC_BASE_TX_INDEX) {
960 sa_idx = pfsa - IXGBE_IPSEC_BASE_RX_INDEX;
961 ipsec->rx_tbl[sa_idx].vf = vf;
962 ipsec->rx_tbl[sa_idx].mode |= IXGBE_RXTXMOD_VF;
963 } else {
964 sa_idx = pfsa - IXGBE_IPSEC_BASE_TX_INDEX;
965 ipsec->tx_tbl[sa_idx].vf = vf;
966 ipsec->tx_tbl[sa_idx].mode |= IXGBE_RXTXMOD_VF;
967 }
968
969 msgbuf[1] = xs->xso.offload_handle;
970
971 return 0;
972
973err_aead:
974 kfree_sensitive(xs->aead);
975err_xs:
976 kfree_sensitive(xs);
977err_out:
978 msgbuf[1] = err;
979 return err;
980}
981
982/**
983 * ixgbe_ipsec_vf_del_sa - translate VF request to SA delete
984 * @adapter: board private structure
985 * @msgbuf: The message buffer
986 * @vf: the VF index
987 *
988 * Given the offload_handle sent by the VF, look for the related SA table
989 * entry and use its xs field to call for a delete of the SA.
990 *
991 * Note: We silently ignore requests to delete entries that are already
992 * set to unused because when a VF is set to "DOWN", the PF first
993 * gets a reset and clears all the VF's entries; then the VF's
994 * XFRM stack sends individual deletes for each entry, which the
995 * reset already removed. In the future it might be good to try to
996 * optimize this so not so many unnecessary delete messages are sent.
997 *
998 * Returns 0 or error value
999 **/
1000int ixgbe_ipsec_vf_del_sa(struct ixgbe_adapter *adapter, u32 *msgbuf, u32 vf)
1001{
1002 struct ixgbe_ipsec *ipsec = adapter->ipsec;
1003 struct xfrm_state *xs;
1004 u32 pfsa = msgbuf[1];
1005 u16 sa_idx;
1006
1007 if (!adapter->vfinfo[vf].trusted) {
1008 e_err(drv, "vf %d attempted to delete an SA\n", vf);
1009 return -EPERM;
1010 }
1011
1012 if (pfsa < IXGBE_IPSEC_BASE_TX_INDEX) {
1013 struct rx_sa *rsa;
1014
1015 sa_idx = pfsa - IXGBE_IPSEC_BASE_RX_INDEX;
1016 if (sa_idx >= IXGBE_IPSEC_MAX_SA_COUNT) {
1017 e_err(drv, "vf %d SA index %d out of range\n",
1018 vf, sa_idx);
1019 return -EINVAL;
1020 }
1021
1022 rsa = &ipsec->rx_tbl[sa_idx];
1023
1024 if (!rsa->used)
1025 return 0;
1026
1027 if (!(rsa->mode & IXGBE_RXTXMOD_VF) ||
1028 rsa->vf != vf) {
1029 e_err(drv, "vf %d bad Rx SA index %d\n", vf, sa_idx);
1030 return -ENOENT;
1031 }
1032
1033 xs = ipsec->rx_tbl[sa_idx].xs;
1034 } else {
1035 struct tx_sa *tsa;
1036
1037 sa_idx = pfsa - IXGBE_IPSEC_BASE_TX_INDEX;
1038 if (sa_idx >= IXGBE_IPSEC_MAX_SA_COUNT) {
1039 e_err(drv, "vf %d SA index %d out of range\n",
1040 vf, sa_idx);
1041 return -EINVAL;
1042 }
1043
1044 tsa = &ipsec->tx_tbl[sa_idx];
1045
1046 if (!tsa->used)
1047 return 0;
1048
1049 if (!(tsa->mode & IXGBE_RXTXMOD_VF) ||
1050 tsa->vf != vf) {
1051 e_err(drv, "vf %d bad Tx SA index %d\n", vf, sa_idx);
1052 return -ENOENT;
1053 }
1054
1055 xs = ipsec->tx_tbl[sa_idx].xs;
1056 }
1057
1058 ixgbe_ipsec_del_sa(xs);
1059
1060 /* remove the xs that was made-up in the add request */
1061 kfree_sensitive(xs);
1062
1063 return 0;
1064}
1065
1066/**
1067 * ixgbe_ipsec_tx - setup Tx flags for ipsec offload
1068 * @tx_ring: outgoing context
1069 * @first: current data packet
1070 * @itd: ipsec Tx data for later use in building context descriptor
1071 **/
1072int ixgbe_ipsec_tx(struct ixgbe_ring *tx_ring,
1073 struct ixgbe_tx_buffer *first,
1074 struct ixgbe_ipsec_tx_data *itd)
1075{
1076 struct ixgbe_adapter *adapter = netdev_priv(tx_ring->netdev);
1077 struct ixgbe_ipsec *ipsec = adapter->ipsec;
1078 struct xfrm_state *xs;
1079 struct sec_path *sp;
1080 struct tx_sa *tsa;
1081
1082 sp = skb_sec_path(first->skb);
1083 if (unlikely(!sp->len)) {
1084 netdev_err(tx_ring->netdev, "%s: no xfrm state len = %d\n",
1085 __func__, sp->len);
1086 return 0;
1087 }
1088
1089 xs = xfrm_input_state(first->skb);
1090 if (unlikely(!xs)) {
1091 netdev_err(tx_ring->netdev, "%s: no xfrm_input_state() xs = %p\n",
1092 __func__, xs);
1093 return 0;
1094 }
1095
1096 itd->sa_idx = xs->xso.offload_handle - IXGBE_IPSEC_BASE_TX_INDEX;
1097 if (unlikely(itd->sa_idx >= IXGBE_IPSEC_MAX_SA_COUNT)) {
1098 netdev_err(tx_ring->netdev, "%s: bad sa_idx=%d handle=%lu\n",
1099 __func__, itd->sa_idx, xs->xso.offload_handle);
1100 return 0;
1101 }
1102
1103 tsa = &ipsec->tx_tbl[itd->sa_idx];
1104 if (unlikely(!tsa->used)) {
1105 netdev_err(tx_ring->netdev, "%s: unused sa_idx=%d\n",
1106 __func__, itd->sa_idx);
1107 return 0;
1108 }
1109
1110 first->tx_flags |= IXGBE_TX_FLAGS_IPSEC | IXGBE_TX_FLAGS_CC;
1111
1112 if (xs->id.proto == IPPROTO_ESP) {
1113
1114 itd->flags |= IXGBE_ADVTXD_TUCMD_IPSEC_TYPE_ESP |
1115 IXGBE_ADVTXD_TUCMD_L4T_TCP;
1116 if (first->protocol == htons(ETH_P_IP))
1117 itd->flags |= IXGBE_ADVTXD_TUCMD_IPV4;
1118
1119 /* The actual trailer length is authlen (16 bytes) plus
1120 * 2 bytes for the proto and the padlen values, plus
1121 * padlen bytes of padding. This ends up not the same
1122 * as the static value found in xs->props.trailer_len (21).
1123 *
1124 * ... but if we're doing GSO, don't bother as the stack
1125 * doesn't add a trailer for those.
1126 */
1127 if (!skb_is_gso(first->skb)) {
1128 /* The "correct" way to get the auth length would be
1129 * to use
1130 * authlen = crypto_aead_authsize(xs->data);
1131 * but since we know we only have one size to worry
1132 * about * we can let the compiler use the constant
1133 * and save us a few CPU cycles.
1134 */
1135 const int authlen = IXGBE_IPSEC_AUTH_BITS / 8;
1136 struct sk_buff *skb = first->skb;
1137 u8 padlen;
1138 int ret;
1139
1140 ret = skb_copy_bits(skb, skb->len - (authlen + 2),
1141 &padlen, 1);
1142 if (unlikely(ret))
1143 return 0;
1144 itd->trailer_len = authlen + 2 + padlen;
1145 }
1146 }
1147 if (tsa->encrypt)
1148 itd->flags |= IXGBE_ADVTXD_TUCMD_IPSEC_ENCRYPT_EN;
1149
1150 return 1;
1151}
1152
1153/**
1154 * ixgbe_ipsec_rx - decode ipsec bits from Rx descriptor
1155 * @rx_ring: receiving ring
1156 * @rx_desc: receive data descriptor
1157 * @skb: current data packet
1158 *
1159 * Determine if there was an ipsec encapsulation noticed, and if so set up
1160 * the resulting status for later in the receive stack.
1161 **/
1162void ixgbe_ipsec_rx(struct ixgbe_ring *rx_ring,
1163 union ixgbe_adv_rx_desc *rx_desc,
1164 struct sk_buff *skb)
1165{
1166 struct ixgbe_adapter *adapter = netdev_priv(rx_ring->netdev);
1167 __le16 pkt_info = rx_desc->wb.lower.lo_dword.hs_rss.pkt_info;
1168 __le16 ipsec_pkt_types = cpu_to_le16(IXGBE_RXDADV_PKTTYPE_IPSEC_AH |
1169 IXGBE_RXDADV_PKTTYPE_IPSEC_ESP);
1170 struct ixgbe_ipsec *ipsec = adapter->ipsec;
1171 struct xfrm_offload *xo = NULL;
1172 struct xfrm_state *xs = NULL;
1173 struct ipv6hdr *ip6 = NULL;
1174 struct iphdr *ip4 = NULL;
1175 struct sec_path *sp;
1176 void *daddr;
1177 __be32 spi;
1178 u8 *c_hdr;
1179 u8 proto;
1180
1181 /* Find the ip and crypto headers in the data.
1182 * We can assume no vlan header in the way, b/c the
1183 * hw won't recognize the IPsec packet and anyway the
1184 * currently vlan device doesn't support xfrm offload.
1185 */
1186 if (pkt_info & cpu_to_le16(IXGBE_RXDADV_PKTTYPE_IPV4)) {
1187 ip4 = (struct iphdr *)(skb->data + ETH_HLEN);
1188 daddr = &ip4->daddr;
1189 c_hdr = (u8 *)ip4 + ip4->ihl * 4;
1190 } else if (pkt_info & cpu_to_le16(IXGBE_RXDADV_PKTTYPE_IPV6)) {
1191 ip6 = (struct ipv6hdr *)(skb->data + ETH_HLEN);
1192 daddr = &ip6->daddr;
1193 c_hdr = (u8 *)ip6 + sizeof(struct ipv6hdr);
1194 } else {
1195 return;
1196 }
1197
1198 switch (pkt_info & ipsec_pkt_types) {
1199 case cpu_to_le16(IXGBE_RXDADV_PKTTYPE_IPSEC_AH):
1200 spi = ((struct ip_auth_hdr *)c_hdr)->spi;
1201 proto = IPPROTO_AH;
1202 break;
1203 case cpu_to_le16(IXGBE_RXDADV_PKTTYPE_IPSEC_ESP):
1204 spi = ((struct ip_esp_hdr *)c_hdr)->spi;
1205 proto = IPPROTO_ESP;
1206 break;
1207 default:
1208 return;
1209 }
1210
1211 xs = ixgbe_ipsec_find_rx_state(ipsec, daddr, proto, spi, !!ip4);
1212 if (unlikely(!xs))
1213 return;
1214
1215 sp = secpath_set(skb);
1216 if (unlikely(!sp))
1217 return;
1218
1219 sp->xvec[sp->len++] = xs;
1220 sp->olen++;
1221 xo = xfrm_offload(skb);
1222 xo->flags = CRYPTO_DONE;
1223 xo->status = CRYPTO_SUCCESS;
1224
1225 adapter->rx_ipsec++;
1226}
1227
1228/**
1229 * ixgbe_init_ipsec_offload - initialize security registers for IPSec operation
1230 * @adapter: board private structure
1231 **/
1232void ixgbe_init_ipsec_offload(struct ixgbe_adapter *adapter)
1233{
1234 struct ixgbe_hw *hw = &adapter->hw;
1235 struct ixgbe_ipsec *ipsec;
1236 u32 t_dis, r_dis;
1237 size_t size;
1238
1239 if (hw->mac.type == ixgbe_mac_82598EB)
1240 return;
1241
1242 /* If there is no support for either Tx or Rx offload
1243 * we should not be advertising support for IPsec.
1244 */
1245 t_dis = IXGBE_READ_REG(hw, IXGBE_SECTXSTAT) &
1246 IXGBE_SECTXSTAT_SECTX_OFF_DIS;
1247 r_dis = IXGBE_READ_REG(hw, IXGBE_SECRXSTAT) &
1248 IXGBE_SECRXSTAT_SECRX_OFF_DIS;
1249 if (t_dis || r_dis)
1250 return;
1251
1252 ipsec = kzalloc(sizeof(*ipsec), GFP_KERNEL);
1253 if (!ipsec)
1254 goto err1;
1255 hash_init(ipsec->rx_sa_list);
1256
1257 size = sizeof(struct rx_sa) * IXGBE_IPSEC_MAX_SA_COUNT;
1258 ipsec->rx_tbl = kzalloc(size, GFP_KERNEL);
1259 if (!ipsec->rx_tbl)
1260 goto err2;
1261
1262 size = sizeof(struct tx_sa) * IXGBE_IPSEC_MAX_SA_COUNT;
1263 ipsec->tx_tbl = kzalloc(size, GFP_KERNEL);
1264 if (!ipsec->tx_tbl)
1265 goto err2;
1266
1267 size = sizeof(struct rx_ip_sa) * IXGBE_IPSEC_MAX_RX_IP_COUNT;
1268 ipsec->ip_tbl = kzalloc(size, GFP_KERNEL);
1269 if (!ipsec->ip_tbl)
1270 goto err2;
1271
1272 ipsec->num_rx_sa = 0;
1273 ipsec->num_tx_sa = 0;
1274
1275 adapter->ipsec = ipsec;
1276 ixgbe_ipsec_stop_engine(adapter);
1277 ixgbe_ipsec_clear_hw_tables(adapter);
1278
1279 adapter->netdev->xfrmdev_ops = &ixgbe_xfrmdev_ops;
1280
1281 return;
1282
1283err2:
1284 kfree(ipsec->ip_tbl);
1285 kfree(ipsec->rx_tbl);
1286 kfree(ipsec->tx_tbl);
1287 kfree(ipsec);
1288err1:
1289 netdev_err(adapter->netdev, "Unable to allocate memory for SA tables");
1290}
1291
1292/**
1293 * ixgbe_stop_ipsec_offload - tear down the ipsec offload
1294 * @adapter: board private structure
1295 **/
1296void ixgbe_stop_ipsec_offload(struct ixgbe_adapter *adapter)
1297{
1298 struct ixgbe_ipsec *ipsec = adapter->ipsec;
1299
1300 adapter->ipsec = NULL;
1301 if (ipsec) {
1302 kfree(ipsec->ip_tbl);
1303 kfree(ipsec->rx_tbl);
1304 kfree(ipsec->tx_tbl);
1305 kfree(ipsec);
1306 }
1307}